This has already been done: http://www.wherifywireless.com/prod_watches.htm Except the Wherify device locks onto a child's wrist, sounds an alarm if cut off, and is cheaper ($99 according to Froogle). Then there's the no-GPS locator version: http://www.ion-kids.com/
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This has already been done: http://www.wherifywireless.com/prod_watches.htm
Except the Wherify device locks onto a child's wrist, sounds an alarm if cut off, and is cheaper ($99 according to Froogle).
Then there's the no-GPS locator version: http://www.ion-kids.com/